<template>
  <div class="header">
    <!-- 折叠按钮 -->
    <div class="collapse-btn" @click="collapseChage">
      <i class="el-icon-menu"></i>
    </div>
    <!--数据管理系统-->
    <div class="logo">数据管理系统</div>
    <!--用户操作-->
    <div class="header-right">
      <div class="header-user-con">
        <!-- 全屏显示 -->
        <div class="btn-fullscreen" @click="handleFullScreen">
          <el-tooltip effect="dark" :content="fullscreen?`取消全屏`:`全屏`" placement="bottom">
            <i class="el-icon-rank"></i>
          </el-tooltip>
        </div>
        <!-- 消息中心 -->
        <div class="btn-bell">
          <el-tooltip effect="dark" :content="message?`有${message}条未读消息`:`消息中心`" placement="bottom">
            <router-link to="">
              <i class="el-icon-bell"></i>
            </router-link>
          </el-tooltip>
          <span class="btn-bell-badge" v-if="message"></span>
        </div>
        <!-- 用户头像 -->
        <div class="user-avator"><img src="static/img/img2.jpg"></div>
        <!-- 用户名下拉菜单 -->
        <el-dropdown class="user-name" trigger="click" @command="handleCommand">
          <span class="el-dropdown-link">
            <span>{{name}}</span>
            <i class="el-icon-caret-bottom"></i>
          </span>
          <el-dropdown-menu slot="dropdown">
            <a href="" target="_blank">
              <el-dropdown-item>关于我们</el-dropdown-item>
            </a>
            <el-dropdown-item divided command="loginout">退出登录</el-dropdown-item>
          </el-dropdown-menu>
        </el-dropdown>
      </div>
    </div>
  </div>
</template>

<script>
  import bus from '../common/bus';
  export default {
    data() {
      return {
        collapse: false,
        fullscreen: false,
        message: '3',
        name: '',
      }
    },
    methods: {
      //名字显示
      username(){
        const username = localStorage.getItem('ms_username');
        this.name = username;
      },
      // 侧边栏折叠
      collapseChage(){
        this.collapse = !this.collapse;
        bus.$emit('collapse', this.collapse);
      },
      // 全屏事件
      handleFullScreen() {
        let element = document.documentElement;
        if (this.fullscreen) {
          if (document.exitFullscreen) {
            document.exitFullscreen();
          } else if (document.webkitCancelFullScreen) {
            document.webkitCancelFullScreen();
          } else if (document.mozCancelFullScreen) {
            document.mozCancelFullScreen();
          } else if (document.msExitFullscreen) {
            document.msExitFullscreen();
          }
        } else {
          if (element.requestFullscreen) {
            element.requestFullscreen();
          } else if (element.webkitRequestFullScreen) {
            element.webkitRequestFullScreen();
          } else if (element.mozRequestFullScreen) {
            element.mozRequestFullScreen();
          } else if (element.msRequestFullscreen) {
            // IE11
            element.msRequestFullscreen();
          }
        }
        this.fullscreen = !this.fullscreen;
      },
      // 用户名下拉菜单选择事件
      handleCommand(command) {
        if(command == 'loginout'){
          localStorage.removeItem('ms_username');
          this.$router.push('/login');
        }
      }
    },
    mounted(){
      this.username();
      if(document.body.clientWidth < 1300){
        this.collapseChage();
      }
    },
  }
</script>

<style scoped>
  .header {
    position: relative;
    box-sizing: border-box;
    width: 100%;
    height: 70px;
    font-size: 22px;
    color: #fff;
    background-color: #07c4a8;
  }
  a{
    text-decoration: none;
  }
  /*折叠按钮*/
  .header .collapse-btn {
    float: left;
    padding: 0 21px;
    cursor: pointer;
    line-height: 70px;
  }
  /*数据管理系统*/
  .header .logo {
    float: left;
    width: 250px;
    line-height: 70px;
    font-size: 20px;
    font-weight: bold;
  }
  /*用户操作*/
  .header-right {
    float: right;
    padding-right: 50px;
  }
  .header-user-con {
    display: flex;
    height: 70px;
    align-items: center;
  }
  /*全屏显示*/
  .btn-fullscreen {
    transform: rotate(45deg);
    margin-right: 5px;
    font-size: 24px;
  }
  /*消息中心*/
  .btn-bell, .btn-fullscreen {
    position: relative;
    width: 30px;
    height: 30px;
    text-align: center;
    border-radius: 15px;
    cursor: pointer;
  }
  .btn-bell-badge {
    position: absolute;
    right: 0;
    top: -2px;
    width: 8px;
    height: 8px;
    border-radius: 4px;
    background: #f56c6c;
    color: #fff;
  }
  .btn-bell .el-icon-bell {
    color: #fff;
  }
  /*用户头像*/
  .user-avator {
    margin-left: 20px;
  }
  .user-avator img {
    display: block;
    width: 40px;
    height: 40px;
    border-radius: 50%;
  }
  /*用户名下拉菜单*/
  .user-name {
    margin-left: 10px;
  }
  .el-dropdown-link {
    color: #fff;
    cursor: pointer;
  }
  .el-dropdown-link span{
    padding: 0 5px;
  }
  .el-icon-caret-bottom{
    font-size: 18px;
  }
</style>
